Power supply cell



FIG. 1 is a front, plan and right side perspective view of a power supply cell showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a left side elevational view thereof.

The right side elevational view is a mirror image of the left side elevational view of FIG. 6.

The broken line showing of environmental structure in FIGS. 1 and 3-6 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a power supply cell, as shown and described. 